Very high resolution satellite images, such as World view2, are important for produce new maps or update existing ones. Maps are useful for planning and navigation purposes in any country. Main aim of this work is the assessment of a methodology to achieve the best possible geometric accuracy in rectified imagery products obtained from World view2. The research includes, studying the effect of the number of Ground Control Points (GCPs) with various 2D polynomial rectification models on the accuracy geometric correction step. The resulting RMSE on the check points (CPs) will be evaluated. Results showed that using a second order polynomial for world view 2 image rectification with 33 well distributed GCPs resulted in a total RMSE 0.96 m for a number of 13 CPs which is less than the value of two pixel size of the used satellite image. Also, by using from 20 GCPs till 33, the accuracy of geometric correction for all polynomial orders has a small variation. |
